Hello,
I am using sql server 2000 as my backend.
If there is any null record in my table , I am getting following error:
***********
Conversion from type 'DBNull' to type 'String' is not valid.
**************
to overcome this error I want to check if its null then don't do anything else do something.
I have tried like this:
If rs.fields("ph").value="NULL" then
else
.........
.....
...
end if
But this does not solve my problem.
Please help me i anyone can.
Thanks.
I have a table that I know has a null or nothing in a field. When I run this query to get a list of them nothing comes back at all but it doesn't error out. Any ideas?
select * from lab_test_add_conf where table_name = null order by lab_test_conf_id
Good morning everyone I am writing a windows forms application that will work similar to the windows messenger popup. I need this application to display a message to the user whenever a record is added to table in my DB. Any help would be appreciated in explaining how I can check the DB for new records.
select name, address, city from table1 I want to append address +'-' + city in this query . I want to show hyphen only if both address and city are not null. If name is null then I don't want to show hyphen. How can I get around this problem. Any help will be appreciated.
I would like an example of checking for NULL within an expression. I don't know the correct syntax. Checking for IsNull is incorrect so is IS Null. Can anyone help me?
I am trying to write a trigger that, on an update, will check to see if more than one record is being updated. If more than one record is being updated, rollback the transaction and print a message. If not, then commit the transaction and print an OK message.
My problem is I am having troubles writing this trigger. I will post my SQL trigger code so far.
I am new with Triggers, so any help or advice is appreciated.
Code:
CREATE TRIGGER trgPaperCheck ON BOOK AFTER UPDATE AS IF UPDATE(Paperback) BEGIN DECLARE @count AS INT SELECT @count = COUNT(Paperback) FROM Book IF @count > 1 BEGIN PRINT('Only one Book record can be updated at a time!') ROLLBACK TRANSACTION END ELSE IF @count =1 BEGIN PRINT('Paperback Updated') COMMIT TRANSACTION END END
I need to check in my Stored procedure if the information passed is null or empty so I can decided to insert the new value or keep the old. How do I accomplish this please in T-SQL. Thanks in advance.
I can't seem to get this work. I'm using SQL2005 I want to check if a record exists before entering it. I just can't figure out how to check it before hand. Thanks in advance. Protected Sub BTNCreateProdIDandName_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles BTNCreateProdIDandName.Click ' Define data objects Dim conn As SqlConnection Dim comm As SqlCommand
' Reads the connection string from Web.config Dim connectionString As String = ConfigurationManager.ConnectionStrings("HbAdminMaintenance").ConnectionString ' Initialize connection conn = New SqlConnection(connectionString)
' Check to see if the record exists If comm = New SqlCommand("EXISTS (SELECT (BuilderID, OptionNO FROM optionlist WHERE (BuilderID = @BuilderID) AND (OptionNO = @OptionNO)", conn)
Then 'if the record is exists display this message. LBerror.Text = "This item already exists in your Option List." Else
'If the record does not exist, add it. FYI - This part works fine by itself. comm = New SqlCommand("INSERT INTO [OptionList] ([BuilderID], [OptionNO], [OptionName]) VALUES (@BuilderID, @OptionNO, @OptionName)", conn)
I've got two tables, one containing a list of company names(approx 10,000 records), the other containing a list of company employees (approx 30,000 records) joined by the CompanyID column.
I have a third table (approx 700 records) containing new employees to be added to the employee table. Each record in this table has the employees details plus the name of their company.
I want to write a query that will check each row in the third table to see if a) the employee exists in the Employees table b) the company exists in the Companies table and c) the employee is listed under the correct company
The query should also handle any combination of the above. So if the company doesn't exist but the employee does, create the company on the companies table and update the appropriate record on the employees table with the new CompanyID etc. etc.
Oh, forgot to mention. The company names in the third table won't be exactly the same as the ones in the Company table so will need to use CharIndex.
I'm trying to check which price grids are in use using the price grid_id, and seeing whether this grid_id exists in another query that checks all active contracts. If the grid_id is present (active) I want to return 'Yes', if not I want it to return 'No'.
There are 385 price grids, but my query is only returning the 315 that are active, and ignoring any that are not used. My code is below, how I can see all the records whether Yes or No:
Select distinct pg.grid_id [Price Grid], pg.grid_name [Grid Name], case when exists (Select c.grid_id from customers c inner join deltickhdr dh on dh.acct = c.custnum and dh.stage <5 where c.type = 'C' and dh.dticket is not null) then 'Yes' else 'No' end [Active]
From gridhdr pg inner join customers c on c.grid_id = pg.grid_id
I am checking to see if the source record is available in the target table using a lookup transformation and if not found i have to insert this record. I have connected the error flow of the lookup transformation to the target. I am acheiving expected results, but is this the best practise? I have not connected to the green arrow to any task.
I've decided to post this as a sticky given the frequency this question is asked.
For those of you wishing to build a package that determines if a source row exists in the destination and if so update it else insert it, this link is for you.
If you want to do a similar concept to Jamie's blog post above, but with the Konesan's Checksum Transformation to quickly compare MANY fields, you can visit here: http://www.ssistalk.com/2007/03/09/ssis-using-a-checksum-to-determine-if-a-row-has-changed/
Hello, I have an SSIS package that affects data in fourteen tables. This SSIS packge is supposed to insert, update, delete and apply various business rules to the data in the new database tabes in the same way that it occurs in the DTS package that affects the old tables in the former database.
After both the DTS packge and SSIS packages are run, the data in the fourteen tables from both databases need to mirror each other. I figure this is the best way that I can know that the new SSIS package is working correctly.
Is there something I can do in an SSIS package that can compare all of the tables between the two databases, record for record then (maybe as error output) produce output in the case where a mistmatch was detected between two given tables? Would a lookup transformation be helpful for this kind or thing, or should I think about doing it some other way?
The old database is on SQL Server 2000, and the new one on SQL Server 2005 64 bit. I've run into problems creating a linked server between the two to where I could just run queries to do this kind of check.
What would be an equivalent expression for ISNULL(datafield, 0) for a table/matrix cell? I am using iif( Len().. to find out if there is something in the cell, and displaying zero in the cell if the length of cell item is 0, however am wondering if there is any better/elegant way of doing that?
There was a similar question to mine a few time ago about conditional execution, but I'm having some problems with it to which I couldn't find any answer, could anyone help?
My condition is checking if a DateTime from a DB table is null. I use the Execute SQL Task to retrieve the record (SELECT TOP 1 * FROM myTable WHERE conditions = TRUE), then I map 2 fields to their respective global variables.
Then I created the green arrow connector and used a precedence expression based on sucess. I used the expression IsNull(@variable). For some reason, even if the @variable comes as null - I checked the info in the DB - it still comes out as '1999-11-30'
I've looked around and the IsNull method can be used to also change the value in the event of it being null, could it be changing my variables value to this even if I didn't pass that value as a parameter to the function? If so, how else can I test it for null? I've tried "== null", "= null" and even ".equals(null)" - which I know is absurd, but I'm running out of options here...
Could you enlighten me, please??? Thanks in advance!
Background: After Insert Trigger runs a sproc that inserts values into another table IF items on the form were populated. THose all work great, but last scenario wont work: Creating a row insert based on Checking that all 22 other items from the prior insert (values of i.columns) were NULL:
IF EXISTS(select DISTINCT i.notes, i.M_Prior, i.M_Worksheet, ... from inserted i WHERE i.notes IS NOT NULL AND i.M_Prior = NULL AND i.M_Worksheet = NULL AND...)
I am simply trying to use SQLCommand in .net to insert a record into a SQL Server 2005 table. There are 2 fields being pulled from a user input for that could have no values selected. In this case I want to insert a null value into the record. I get an error that Null is no longer supported and that I should use System.DBNull, but that can't be used as an expression. How do I do this? Thank you in advance.
Seems that when i use the edit functionality of the formview, and there are NULLs in the record, that my sql update statement (default from the FormView wizard) doesnt work (nothing updates). However, if i populate all fields, everything works fine. I have modified the FormView edit template to add my own textboxes and dropdowns to simplify the user record editing. Because it works when all fields are populated with non-NULL values, Seems my Bind's are all correct. ---Jim
I'm runing an access application that has an sql server 2000 as its back end. Up to few weeks ago everything was fine, but now when a user tries to add a record from an access form into the database I get an error that it cannot insert a null value into the field.
The two fields that cause the problem do not allow nulls as they keep the user name and the time that the record was inserted into the table.
I trace the access program but I cannot pinpoint where the valuees are inserted into the table. All the other fields are bound on the form. When the problem first appeard I found out that at that same day the active directory server that keeps the logins to the network was restarded. The problem appears on the live database that the users use and as well as on my test sql server that is not connected to the main database server but is instaled on my pc together with the access application.
But I still have to login onto the same network to use my pc that is part of the same domain
The authentication on the sql server 2000 is windows only.
Hello - I have a column in a table (SQL 2005 EE) with a Data Type of smalldatetime and a Default Value of getdate(). When I insert a record from my webpage the new record contains the correct date via getdate(). However if I update the record from my webpage the date of the record then becomes NULL. Is this normal? Is there anything I can do about this from sql server? I am inserting/updating via an formview and ODS, using standard insert/update methods. Cheers Marco
I'm sorry, this question has a pretty long preamble, but bear with me as this will fully explain my problem, and save a number of clarification questions.I am using Visual Web Developer 2005 Express, with SQL Server 2005. After reading a Microsoft article saying that it was much better to use a three tier architecture with data adapters than to write explicit queries, I have used this approach extensively, and generally it works very well. Typical code patterns are: - Dim taPassenger As New ShippingTableAdapters.VPassengerTableAdapter Dim tbpassenger As Shipping.VPassengerDataTable Dim trpassenger As Shipping.VPassengerRow ..... ' to process all passengers from a voyage: - tbpassenger = taPassenger.GetDataByVOYid(Voyageid) For Nbr As Integer = 1 To tbpassenger.Count trpassenger = tbpassenger(Nbr - 1) ' I now have the row available in properly-typed fields, eg trpassenger.vpxName ... Next ' to read and process a single passenger tbpassenger = tapassenger.GetDataByVPXid(VPXid) trpassenger = tbpassenger(0)The table adapter has been created with Insert,Update, Delete methods. Thus you can assign values to row fields, and then update the row: - trpassenger.VPXName = "New Name" .... tapassenger.update(trpassenger)There are actually several overloads of the update method: you could have written a field list, like this, where the names (VPXid etc) would be defined in my program as variables of the appropriate type for the corresponding column. tapassenger.update(VPXid, VPXName, VPXAge, ....HOWEVER, this doesn't work properly if you have non-string data that could be null. Thus if the fourth field is a foreign key that could be null, if you write Dim VPXVoyId as Nullable(of GUID) VPXVoyid = nothing tapassenger.update(VPXid, VPXname, VPXAge, VPXVoyid, ...or Trpassenger.VPXVoyid = Nothing tapassenger.update(trpassenger) you do NOT put a null value into the database. Instead you store a value of "00000000-0000-0000-0000-000000000000". You can solve this annoying problem in two ways: -A. If you will ALWAYS be storing a null value at this point of your program, then simply write the update statement like this: - tapassenger.update(VPXid, VPXname, VPXAge, Nothing, ...Here "Nothing" actually means "DBNull" even though it doesn't mean this when used in a normal VB assignment (and neither does DBNull).B You can use the SetxxxxNULL method: - If trpassenger.VPXVoyid = nothing then trpassenger.SetVPXVoyidNull End If tapassenger.update(trpassenger) Thus when the program logic is complex and there are many paths to the update statement I will often put statements such as this in front of the update statement, using SetxxxxxNull for all non-string values that may be null. You don't need to worry about string values because the Nullvalue property can be used to simply say that Null values are empty, and it all works properly, but for reasons unknown Microsoft have prohibited this for other data types. Now at last we get to my question, which is "How do I do the equivalent for an Insert?" tapassenger.insert does not have any overloads, and the only form is tapassenger.insert(field list). But this creates the problem above: if VPXVoyid = nothing then I insert the not-null value of "00000000-0000-0000-0000-000000000000". If I COULD use the form tapassenger.insert(trpassenger), then I'd have another problem: if you haven't set trpassenger (for example with trpassenger = tbpassenger(0)) then it will not exist, so you will get an exception when you try to reference it. Yet you can't write If isnothing(trpassenger) then trpassenger = new shipping.vpassengerrow) (I've tries this both as an assignment, and as a Dim statement) end ifSo far I can think of only two solutions, both awful: -a/ Use multi-choice logic to choose an appropriate insert statement. If there is only one or two possibly-null fields, I could write:- If field4 = nothing then trpassenger.insert (VPXid, VPXname, VPXAge, Nothing, .. However if there is more than one possibly-null field, you need (2 to the power of nbr-of-possibly-null-fields) insert statements, with of course a lot of testing to choose which oneb/ I could insert the record with nulls, then read it back and update it. Surely there is a better way! Help! Thank you, Robert Barnes.
I used this statement, select * from table1 where date1 = null, in SQL Query window and got a few records back. Now, I used the same statement in my VB 5 code and no record is found. How do I select all the records in table1 which do not have values in field date1? Thanks for the help.
Hi guys, I have made several Access-based CMSs but now I am using SQL Server. I can read the records but my first attempts at writing are resulting in new records (with new ID) but all the fields are null. I am posting the data from a form to the same page and an if /then statement catches the flag in the URL and runs the update script below. All the field names are correct. if request.QueryString("add")<> "" then Dim rsUpdateEntry Set rsUpdateEntry = Server.CreateObject("ADODB.Recordset") rsUpdateEntry.Open "SELECT * from generic_country_info" , oConn, 2, 3
Been trying to come up with a query to filter-down my sample set intodistinct records. For instance, lets say column1 is a sample set,column2 is the parameter, and column3 is a name and column4 is a type(lets also say there is a fifth column (id) that is an id). What Ineed is one record per type per sample only if type is given, if not,then return that record as well.I've used a subquery to get as close to the desired query is aspossible:select * from table1where id in (select min(id) from table1where column1="A"group by column1, column2)Here's an example of all data for sample "A":1 2 3 4----------A 1 X PA 1 Y PA 1 Z PA 2 WA 3 WA 4 T PA 5 U PA 6 V PA 7 TA 7 UA 7 VI want output :1 2 3-------A 1 X PA 2 WA 3 WA 4 T PA 5 U PA 6 V PA 7 TA 7 UA 7 VExcept the above query will exclude the last two records becausecolumn3 is not 'grouped by'.Basically I need to reduce any 'range' of records per sample (columna) where column4 is not null (ie = 'P'), to only one record andkeeping all others. Thanks in advance:-B
Hi,I have an updatable DataGrid linked to a SQLDataSource in a web site developed using VS2005. Update works fine unless a value in the existing row is Null. Only one column in the database allows nulls.Putting a debug stop in the SqlDataSource1_Updating event, I checked the parameter value in the Immediate window and got the following result:?e.Command.Parameters(16){System.Data.SqlClient.SqlParameter}System.Data.SqlClient.SqlParameter: {System.Data.SqlClient.SqlParameter}DbType: Int32 {11}Direction: Input {1}IsNullable: FalseParameterName: "@original_FiresolveJobNo"Size: 0SourceColumn: ""SourceColumnNullMapping: FalseSourceVersion: Current {512}Value: NothingIs there a property I can set to generate a suitable Null check clause for the Update statement?Many Thanks,Keith.
Hi All In My application when i want to work with sqldatasource for updation and delteion tasks it is working properly when all the columns consists the data. If any of the column consists the null values its not updating and deleting. Advices are needed.Thank uBaba
Data from as400 imports into SQL with blank fields which is the way as400 outputs records. How can you insert previous record of data null or blank field. ex:
I am looking for the best way to check to see if any columns are still NULL in a record. I have a form that gets filled out by users and the values entered into TableA. There are 6 columns in the table, 5 are responses and column6 indicates if the record is complete. So I want a way to see if all of the first 5 columns are NOT NULL and, if so, mark column6 with a 1.
I am thinking this would be a good thing for a trigger on INSERT or UPDATE to check to see if the first 5 columns are filled in and then mark the record as complete.
I have some VB.NET code to retrieve data from an SQL Server database and display it. The code is as follows: ------------------------------------------------------------------------------------------------------- sw_calendar = calendarAdapter.GetEventByID(cid) If sw_calendar.Rows.Count > 0 Then
lblStartDateText.Text = "*** Not Found ***" lblEndDateText.Text = "*** Not Found ***" lblTitleText.Text = "*** Not Found ***" lblLocationText.Text = "*** Not Found ***" lblDescriptionText.Text = "*** Not Found ***" End If ------------------------------------------------------------------------------------------------------- If all of the fields in the database has values, everything works ok. However, if the title, location or description fields have a null value, I receive the following error message: Unable to cast object of type 'System.DBNull' to type 'System.String'. I've tried a bunch of different things such as:
Adding ".ToString" to the database field, Seeing if the value is null: If sw_calendar(0).description = system.DBnull.value... ...but either I get syntax errors in the code, or if the syntax is ok, I still get the above error message. Can anyone help me with the code required to trap the null within the code example I've provided? I'm sure there are other, and better, ways to code this, but for now I'd really like to get it working as is, and then optimize the code once the application is working (...can you tell I have a tight deadline )
I have this View and want to also see Clubs that do not have current memberships.I have the IS NULL but not seeing the Clubs that do NOT have memberships. attribute.PersonMembership is a SQL table that has membership information.
The "PersonMembership" has all the membership records from 2015 through 2019 of membertypeid 1-4 for the sampling.Since the syntax used in Access do not carry over without modifications to SQL, SQL syntax to make it work in SQL.And if you know the proper SQL syntax for "Between Year(Date())+IIf(Month(Date())>=7,1,0) And Year(Date())+IIf(Month(Date())>=7,1,0)+4" instead of what I currently have in SQL, that would be wonderful.
The 2nd table is for storing product codes for customers, in other words, one product can have different ProductCode for different customers. But some customers do not have ProductCode for a ProductID.
I want to create a query to return all the Products and its ProductCode (null is valid) for a specific customer.
I tried:
SELECT dbo.tblProductCodes.ProductCode, dbo.tblProductCodes.CustomerID, dbo.tblProducts.ProductName, dbo.tblProducts.ProductID FROM dbo.tblProducts LEFT OUTER JOIN dbo.tblProductCodes ON dbo.tblProducts.ProductID = dbo.tblProductCodes.ProductID WHERE dbo.tblProductCodes.CustomerID = 2
But the query left out all products that does not have ProductCode value in tblProductCodes table for CustomerID = 2. I want all the ProductName returned from query and render null or empty string for ProductCode value if the code does not exist in tblProductCodes table for the customer.
